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Indolo[3,2-b]indole donor-based D–π–A dyes for DSCs: investigating the role of π-spacers towards recombination†
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2018-11-21 00:00:00 , DOI: 10.1039/c8nj04561e
P. V. Santhini 1, 2, 3, 4, 5 , Jayadev V. 3, 4, 5, 6, 7 , Sourava C. Pradhan 3, 4, 5, 6, 7 , Sivasankaran Lingamoorthy 3, 4, 5, 6, 7 , Nitha P. R. 1, 2, 3, 4, 5 , Chaithanya M. V. 1, 2, 3 , Rakesh K. Mishra 3, 8, 9, 10, 11 , Narayanan Unni K. N. 3, 4, 5, 6, 7 , Jubi John 1, 2, 3, 4, 5 , Suraj Soman 3, 4, 5, 6, 7
Affiliation  

Dye solar cells (DSCs) are gaining increasing interest since the recent realization of their high-performance potential in low/indoor light environments. Fused conjugated metal-free organic dyes have become a prominent class of dyes used in DSC in recent times by virtue of their better backbone rigidity, efficient charge transport properties, and the opportunity they provide for further structural modifications. Herein, we report the synthesis and characterization of three metal-free D–π–A organic dyes employing indolo[3,2-b]indole as the donor unit. The optical, electrochemical and photovoltaic properties have been analyzed in detail as a function of π-spacers, namely, benzene (IID-1), thiophene (IID-2) and furan (IID-3). Eventually, the best performance was demonstrated by the dye bearing benzene as the π-spacer. The role of recombination in determining the photovoltaic performance as a function of the nature of π-spacers was explored in detail, using various perturbation techniques on the fabricated devices, and compared with the results obtained from molecular orbital calculations.

中文翻译:

用于DSC的 Indolo [3,2 - b ]吲哚供体基D–π–A染料:研究π-间隔子在重组中的作用

自从最近在低/室内光照环境中实现高性能潜力以来,染料太阳能电池(DSC)受到越来越多的关注。熔融共轭的无金属有机染料由于其更好的骨架刚性,有效的电荷传输性质以及它们提供进一步的结构修饰的机会,近年来已成为DSC中使用的主要染料。在这里,我们报告了三种以吲哚[3,2- b ]吲哚为供体单元的无金属D–π–A有机染料的合成和表征。已经详细分析了光学,电化学和光电性质随π-间隔物的变化,即苯(IID-1),噻吩(IID-2)和呋喃(IID-3))。最终,以苯作为π-间隔基的染料表现出最好的性能。在制造的器件上使用各种微扰技术,详细探讨了重组在决定光伏性能(取决于π间隔物的性质)方面的作用,并将其与分子轨道计算获得的结果进行了比较。
更新日期:2018-11-21
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